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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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May 31, 2012 | May 31, 2011 | May 31, 2010
Commitments and Contingencies (Textual) [Abstract] |  |  |
Lines of credit amount outstanding | $ 0 |  |
Irrevocable standby letters of credit amount available | 46.8 | 47.4 |
Irrevocable stand by letters of credit amount outstanding | 0 |  |
Expiry date range of letters of credit | July 2012 to December 2012 |  |
Commitments to purchase capital assets | 7.6 |  |
Rent expense | 43.0 | 45.4 | 46.9
Minimum future payment obligations under purchase orders and contractual arrangements | $ 88.4 |  |

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- Details
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- Definition Commitments to purchase capital assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Expiry date range of letters of credit. + References No definition available. + Details
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- Definition Irrevocable standby letters of credit amount available. + References No definition available. + Details
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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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